Just got done useing Dnk's ASD on all my arrows, took nigh onto a week, lol. I noticed after I did my hunting arrows w/ slicks, I had a little wobble in a few. May have been there all along, dunno, as I shot several at various ranges and decided they were all good enough. The instructions say to loosen, turn washer and retighten real tight and recheck. Dang if that didn't work, but I'm puzzled as to why. I think it's safe to assume the washers are flat, and I'm sure the blades were nestled up high as they would go, so as not to protrude out where washer mates and maybe cause the problem. Any of ya'll can explain this to me? I can recall spinning inserts many years ago w/ candle to align b-heads for recurve, never bothered w/ older xbows as they were 20 yd max in those days, [late 70's]. I got em all [8] ready to go now, but have no idea how or why that worked. Also, use this as a warning to all you guys I told just screw em on and go, shoulda added check em. Thanks and sorry for the long post.